I have an actuator pin which is leaking when closed, i have swapped the actuator itself but that has not resolved the problem. I have ordered a replacement actuator valve but I'm not sure what i need to do to replace,,, if i put a spanner on it straight away I'm guessing that water will go everywhere so guessing that i need to put the thermostatic valve to 0 . and close shut off valve (top right with white cap)??? The valve is on the blue actuator on the nearest port to the pump.. grateful for any advice on how to replace.
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